Parameterization of Hargreaves & Samani and Angstrom-Prescott equations to estimate solar radiation in the region of Telemaco Borba, Parana State, Brazil

Daniela Jerszurki, Jorge Luiz Moretti de Souza

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The estimation of solar radiation (Rs) by mathematical equations is useful when there are no weather stations that record. The objective of this study was to estimate, for the periods annual, seasonal and monthly, the empirical coefficient Krs of Hargreaves & Samani equation and the coefficients a and b of Angstrom-Prescott equation for estimating Rs, comparing estimated values with observed values for Telemaco Borba, Paraná. Used historical data daily (January 1981 to January 2011) maximum, minimum and average air temperature, cumulative global solar radiation, daily insolation and extraterrestrial radiation (Ra), calculated using a methodology recommended by the Food and Agriculture Organization of the United Nations- (FAO). There is greater association between estimated and observed Rs with values of annual and seasonal Krs. The coefficients a and b show indices "c" "great" ("c">0.85) to estimate Rs in the periods analyzed. The results suggest that the coefficients found are used to estimate values of the region.

Original languageEnglish
Pages (from-to)383-389
Number of pages7
JournalCiencia Rural
Volume43
Issue number3
DOIs
StatePublished - 1 Mar 2013
Externally publishedYes

Keywords

  • Empirical coefficient
  • Estimate
  • Solar radiation

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Agronomy and Crop Science
  • General Veterinary

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